I've been to 3 on the list, Owl's Head, Henry Ford, and AACA, Hershey.
Another, rather iconic ( not to mention, FREE) auto museum is in Reading, PA at the "A toZ vacuum cleaner" store! Its located on the second floor; any employee can direct you up and turn on the lights. Mostly 50s-60s cars and memorobilia. A fun visit if you are ever in Reasing.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags